<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  </head>

  <body>
    <div id="app">
      <div>
        <span>全选:</span>
        <input v-model="isAll" type="checkbox" />
        <button @click="Inverse(isAll)">反选</button>
        <ul>
          <li v-for="item in arr" :key="item.id">
            <input type="checkbox" v-model="item.checked" />
            <span>{{item.name}}</span>
          </li>
        </ul>
      </div>
    </div>
    <script src="../vue.js"></script>
    <script>
      const app = new Vue({
        el: '#app',
        data: {
          arr: [
            {
              name: '猪八戒',
              checked: false
            },
            {
              name: '孙悟空',
              checked: false
            },
            {
              name: '唐僧',
              checked: false
            },
            {
              name: '白龙马',
              checked: false
            }
          ]
        },
        computed: {
          isAll: {
            get() {
              return this.arr.every(item => item.checked)
            },
            set(value) {
              console.log(value)
              this.arr.forEach(item => (item.checked = value))
            }
          }
        },
        methods: {
          Inverse(isAll) {
            this.arr.forEach(item => (item.checked = !item.checked))
          }
        }
      })
    </script>
  </body>
</html>
